Metal seal comprising a textured outer sealing layer

a metal seal and outer sealing technology, applied in the direction of engine seals, flanged joints, pipe joints, etc., can solve the problems of limited leakage risk, inability to solve caulking problems on its part, and inducing leakage, so as to facilitate the plastic flow of material, wide sealing run, and reduce the effect of bearing area ratio

Pending Publication Date: 2022-02-24
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]Thanks to the invention, the use of a metal seal having a textured surface makes it possible to have the advantage of favouring the penetration of the sealing surface of the seal into the anfractuosities of the surface opposite whilst maintaining a wide sealing run: on the one hand, by reducing the bearing area ratio, and on the other hand, by facilitating the plastic flow of the material. Thus, the invention makes it possible to limit the necessary application forces in order to obtain the sealing or improve the sealing for a given application force.

Problems solved by technology

However, this has a certain number of drawbacks.
A radial defect, even of small dimension, on the sealing face risks strongly inducing a leakage.
In comparison with a solution with a single projection, the leakage risk is limited in the event of radial defect.
The caulking problem for its part is not resolved.
In this case, it is noticed that the known prior art does not make it possible to work efficiently with this type of material: sealing correctly on a wide run without in as much increasing the compressive force or damaging the flanges is not achievable.

Method used

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  • Metal seal comprising a textured outer sealing layer
  • Metal seal comprising a textured outer sealing layer
  • Metal seal comprising a textured outer sealing layer

Examples

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first embodiment

[0043]FIG. 3 illustrates a detailed view, according to A, of FIG. 2 to present the textured surface, with circular-shaped depressions,

[0044]FIG. 4 is a partial sectional view according to C-C of FIG. 3,

second embodiment

[0045]FIG. 5 illustrates a detailed view, according to A, of FIG. 2 to present the textured surface, with oblong-shaped depressions,

[0046]FIG. 6 is a graph illustrating the interest of the texturing by presenting the evolution of the sealing G, expressed in Pa·m3 / s, for various surface texturings depending on the seating pressure PrA, expressed in MPa, and

[0047]FIGS. 7 to 19 illustrate, in partial section, miscellaneous examples of metal seals in accordance with the invention, FIGS. 11, 15, 16 and 19 presenting detailed sectional views of depressions.

[0048]In all of these figures, identical references may designate identical or similar elements.

[0049]In addition, the various portions shown in the figures are not necessarily according to a uniform scale, to make the figures more readable.

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Abstract

A static metal seal comprising an outer sealing layer, wherein the outer sealing layer comprises a textured surface that is configured to come into contact with the surfaces that are to be sealed, the textured surface comprising a network of depressions spaced apart from one another on the textured surface, wherein the depressions are blind, do not pass all the way through the outer sealing layer, and do not communicate with one another.

Description

TECHNICAL FIELD[0001]The present invention relates to the field of static metal seals.[0002]It is applicable in various industrial fields, and typically for the production of the sealing between two flanges.[0003]Thus, the invention relates to a static metal seal comprising an outer sealing layer having a textured surface.PRIOR ART[0004]The metal seal is a technology widely used in many critical sealing applications, typically in situations where one or more of the following four conditions are found: ultrahigh vacuum, high pressure, chemically aggressive liquid, high temperature.[0005]As for any seal, it is desired to jointly obtain: a high level of sealing; a lowest possible compressive force; a largest possible sealing run.[0006]Resolving this problem is currently feasible, subject to having, in contact with the flanges, a highly ductile sealing material, such as for example silver.[0007]Thus, an example of metal seal is described in French patent application FR 2 151 186 A1. Acc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16L23/20F16J15/08
CPCF16L23/20F16J15/0893F16J15/0881F16J15/0806
Inventor LEDRAPPIER, FLORENTJULIAA, JEAN-FRANÇOISTEISSIER, MARINLEFRANCOIS, MICHELDAVID, THIERRYZAOUTER, TONY
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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